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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: matching beam tubes for pp? (longish) posted by robertpeterson56 on March 11, 2006 at 10:50:14:
Yes it does - which is good for the tube's safety - but does nothing for the sound itself.As this is a buget amp - I assume you are using pretty basic output transformers which will almost certainly use EI stype cores, or even more sensitive - low cost toroids.
Such OPT's can, IME, be VERY sensitive to out of balance DC currents - so the tubes need to be either VERY well matched - or better still, have bias trimming possible to match the currents very closely in the amp itself.
Allen
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Follow Ups
- Fatbottle says below that cathode bias finds it's own operating points. - Allen Wright 05:19:41 03/12/06 (8)
- EI cores and C-cores with dc unbal plate currents - mqracing 09:36:18 03/12/06 (7)
- MIke, womderfully informative reply! - Allen Wright 10:07:26 03/12/06 (6)
- Re: MIke, womderfully informative reply! - mqracing 17:44:42 03/12/06 (3)
- Re: MIke, womderfully informative reply! - Allen Wright 10:17:33 03/13/06 (2)
- Re: MIke, womderfully informative reply! - mqracing 13:57:31 03/13/06 (0)
- I have heard the Peerless - Russ57 12:07:56 03/13/06 (0)
- off topic: pic for Allen - mqracing 10:47:00 03/12/06 (1)
- Thanks Mike - that is SERIOUSLY frightening! (nt) - Allen Wright 09:45:42 03/13/06 (0)
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